An assortment of marine-grade #316 stainless steel carriage bolt variants from The Hillman Group. Carriage bolts are designed to fasten a wooden face to either a wood or metal frame. Its flat head is designed to eliminate the need for a washer and provide a semi-flush finish to applications. The square underside of the head is self locking to eliminate spinning and need for a driving tool. Variants included in this assortment feature coarse 5/16"-18 screw thread and range from 3/4" to 4" long. Full assortments of #40302 contain eight (8) refills comprised of Hillman item numbers #40303 - #40310.